US artificial intelligence (AI) giant Anthropic has accused Chinese e-commerce and technology firm Alibaba of "brazenly" and "illicitly" extracting its Claude AI model's capabilities. In a letter seen by the BBC, the San Francisco-based company said operators linked to Alibaba carried out almost 29 million exchanges with Claude using thousands of fraudulent accounts in what it called the largest extraction campaign of its kind. Anthropic urged Congress to penalise the companies behind attacks